Parse background data.

.gitignore

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+################################################################################
+# This .gitignore file was automatically created by Microsoft(R) Visual Studio.
+################################################################################
+
+/EarthboundBattleBackgrounds/.vs/EarthboundBattleBackgrounds
+/EarthboundBattleBackgrounds/EarthboundBattleBackgrounds/x64/Debug

EarthboundBattleBackgrounds/EarthboundBattleBackgrounds.sln

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EarthboundBattleBackgrounds/EarthboundBattleBackgrounds/EarthboundBattleBackgrounds.vcxproj

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EarthboundBattleBackgrounds/EarthboundBattleBackgrounds/EarthboundBattleBackgrounds.vcxproj.filters

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+      <UniqueIdentifier>{67DA6AB6-F800-4c08-8B7A-83BB121AAD01}</UniqueIdentifier>
+      <Extensions>rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe;resx;tiff;tif;png;wav;mfcribbon-ms</Extensions>
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EarthboundBattleBackgrounds/EarthboundBattleBackgrounds/EarthboundBattleBackgrounds.vcxproj.user

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+<Project ToolsVersion="Current" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup />
+</Project>

EarthboundBattleBackgrounds/EarthboundBattleBackgrounds/main.cpp

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+#define OLC_PGE_APPLICATION
+#include "olcPixelGameEngine.h"
+
+
+struct Rom{
+	const static uint16_t MIN_INDEX{};
+	const static uint16_t MAX_INDEX{326U};
+	std::array<uint32_t,114>paletteBits;
+	std::array<uint32_t,103>graphicsBits;
+	enum Command{
+		UNCOMPRESSED_BLOCK,
+		RUN_LENGTH_ENCODED_BYTE,
+		RUN_LENGTH_ENCODED_SHORT,
+		INCREMENTAL_SEQUENCE,
+		REPEAT_PREVIOUS_DATA,
+		REVERSE_BITS,
+		UNKNOWN_1,
+		UNKNOWN_2,
+	};
+
+	struct DataBlock{
+		uint32_t addr,ptr;
+		std::string_view data;
+		DataBlock(std::string_view data,uint32_t loc)
+		:data(data){
+			addr=ptr=loc;
+		}
+		uint8_t readInt8(){
+			return data[ptr++];
+		}
+		uint16_t readShort(){
+			return readInt8()|(readInt8()<<8);
+		}
+		uint32_t readInt32(){
+			return readInt8()|(readInt8()<<8)|(readInt8()<<16)|(readInt8()<<24);
+		}
+	};
+
+	struct BattleBackground{
+		BattleBackground(std::string_view data,uint32_t index){
+			DataBlock readData{data,0xDCA1+index*uint32_t(this->data.size())};
+			for(int i=0;i<this->data.size();i++){
+				this->data[i]=readData.readInt8();
+			}
+		};
+		union{
+			std::array<byte,17>data;
+			struct{
+				byte graphicsInd;
+				byte paletteInd;
+				byte bbp;
+				byte paletteCycleType;
+				byte paletteCycle1StartInd;
+				byte paletteCycle1EndInd;
+				byte paletteCycle2StartInd;
+				byte paletteCycle2EndInd;
+				byte paletteCycleSpeed;
+				byte horizontalMovement;
+				byte verticalMovement;
+				byte horizontalAcceleration;
+				byte verticalAcceleration;
+				uint32_t animationEffectsData;
+			};
+		};
+		uint32_t GetAnimation(){
+			return (data[13]<<24)+(data[14]<<16)+(data[15]<<8)+data[16];
+		}
+	};
+	std::string data;
+	std::vector<BattleBackground>backgrounds;
+	Rom(){
+		std::ifstream dataStream{"truncated_backgrounds.dat",std::ios_base::binary};
+		while(dataStream.good())data+=dataStream.get();
+			
+		for(uint16_t i=0;i<=MAX_INDEX;i++){
+			backgrounds.emplace_back(data,i);
+			paletteBits[backgrounds.back().paletteInd]=backgrounds.back().bbp;
+			graphicsBits[backgrounds.back().graphicsInd]=backgrounds.back().bbp;
+		}
+	}
+};
+
+// Override base class with your custom functionality
+class EarthboundBattleBackgrounds : public olc::PixelGameEngine
+{
+public:
+	EarthboundBattleBackgrounds()
+	{
+		// Name your application
+		sAppName = "Earthbound Battle Backgrounds";
+	}
+
+	Rom rom;
+
+public:
+	bool OnUserCreate() override
+	{
+		CreateLayer();
+		EnableLayer(1U,true);
+		return true;
+	}
+
+	bool OnUserUpdate(float fElapsedTime) override
+	{
+		
+		return true;
+	}
+};
+
+int main()
+{
+	EarthboundBattleBackgrounds demo;
+	if (demo.Construct(256, 224, 4, 4))
+		demo.Start();
+	return 0;
+}